Blood makes up about 7% of your body's weight. The average adult has 10 pints of blood in his or her body. One unit of blood is roughly the equivalent of one pint.… This proportion is much greater in children, and slightly different in men and women. Men, on average, have 8 to 10 pints, while women have 5 to 8 pints. That is just over a gallon or 4 - 5 liters for men and slightly less for women. Larger people and populations can go much higher, up to 8-12 pints depending on the size of the person.

8-12 pints depending on the size of the person. Actually about 5 litre of blood is present in a normal human body It varies by age and weight, but the "standard" a…nswer is 6 liters, or about a gallon and a half.

The total blood volume in the average adult is approximately 60-65 ml/kilogram body weight. Children have approximately 70 ml/kilogram body weight and obese patients approxima…tely 55ml/kilogram body weight.http://wiki.answers.com/Q/How_much_blood_do_humans_have&action=edit

The total blood volume in the average adult is approximately 60-65 ml/kilogram body weight. Children have approximately 70 ml/kilogram body weight and obese patients approxima…tely 55ml/kilogram body weight.